Geologic Map of the Lewes and Cape Henlopen Quadrangles, Delaware

The Delaware Geological Survey (DGS) began publishing the geologic map series in 1970. Geologic maps 1 to 9 were published with traditional hand drafting and printing of geologic boundaries and U.S. Geological Survey (USGS) topographic Mylar base maps. DGS moved toward digital publication in the 21st century. Geologic map 12 polygons were digitized in ArcInfo^® 8, and USGS topographic Mylar maps were scanned and georeferenced for the base map. These digital layers were compiled in Adobe Illustrator 9 for final publication format. Future DGS map publications will use Delaware Spatial Data Framework layers for digital base map data.